CN111669782B - Network anti-blocking method and device based on LoRa - Google Patents
Network anti-blocking method and device based on LoRa Download PDFInfo
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- CN111669782B CN111669782B CN202010628602.7A CN202010628602A CN111669782B CN 111669782 B CN111669782 B CN 111669782B CN 202010628602 A CN202010628602 A CN 202010628602A CN 111669782 B CN111669782 B CN 111669782B
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- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 title claims abstract description 117
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000005540 biological transmission Effects 0.000 claims abstract description 51
- 238000012790 confirmation Methods 0.000 claims abstract description 6
- 238000012545 processing Methods 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 230000006855 networking Effects 0.000 description 11
- 238000004891 communication Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 108010003272 Hyaluronate lyase Proteins 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0289—Congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The embodiment of the invention provides a network anti-blocking method and device based on LoRa, which are applied to a system comprising a LoRa gateway and sub-nodes, wherein data sent by each sub-node to the LoRa gateway comprises a command packet and a data packet; the command packet comprises a frequency hopping packet; the method comprises the following steps: judging whether the LoRa gateway receives a frequency hopping packet from a child node or not; the frequency hopping packet comprises a channel and a transmission rate requested by the child node; if the judgment result is yes, returning a confirmation instruction to the child node through the LoRa gateway, and setting the LoRa gateway based on the frequency hopping packet; and transmitting the data packet between the LoRa gateway and the child node based on the set channel and the transmission rate. The scheme uses the frequency hopping technology to realize the wireless transmission system with the anti-blocking function. The method is used for solving the defect of data packet blocking of the wireless transmission system in severe environments such as outdoors.
Description
Technical Field
The invention relates to the technical field of wireless transmission, in particular to a network anti-blocking method and device based on LoRa.
Background
In indoor or outdoor networking application of the Internet of things, multiple nodes and high-frequency data acquisition and transmission are frequently used, and in practical application, severe environments such as narrow space and the like with high temperature, high humidity and darkness are frequently met, and twenty-four hours of uninterrupted data acquisition is required.
The current common networking structure comprises star networking, ring networking, tree networking, net networking, bus networking and the like; as for the wireless communication scheme, there are common: a 2G communication module using GRPS/GSM; a module using 2.4G as a wireless transmission frequency band, such as NRF24L01, a module using bluetooth protocol for transmission, such as NRF52832, a module using ZigBee protocol for transmission, such as CC2530, and the like. However, when the networking structure is too complex or the communication data is saturated or the nodes are too many, the phenomena of unstable transmission, short transmission distance, delay or loss of data packets and the like occur in the wireless networking; particularly, the child nodes frequently collect data and report the data to the gateway, and channel busy and channel blocking can be inevitably generated.
Thus, there is a need for a method that addresses the problem of channel blockage.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a network anti-blocking method and device based on LoRa. The method is used for solving the defect of data packet blocking of the wireless transmission system in severe environments such as outdoors.
Specifically, the present invention proposes the following specific embodiments:
the embodiment of the invention provides a network anti-blocking method based on LoRa, which is applied to a system comprising a LoRa gateway and sub-nodes, wherein data sent by each sub-node to the LoRa gateway comprises a command packet and a data packet; the command packet comprises a frequency hopping packet; the method comprises the following steps:
judging whether the LoRa gateway receives a frequency hopping packet from a child node or not; the frequency hopping packet comprises a channel and a transmission rate requested by the child node;
if the judgment result is yes, returning a confirmation instruction to the child node through the LoRa gateway, and setting the LoRa gateway based on the frequency hopping packet;
and transmitting the data packet between the LoRa gateway and the child node based on the set channel and the transmission rate.
In a specific embodiment, before determining whether the LoRa gateway receives the frequency hopping packet from the child node, the method further includes:
initializing the LoRa gateway and each child node by powering on;
setting the same channel and the same transmission rate for the LoRa gateway and each child node;
setting the address of the LoRa gateway as a preset address so that the LoRa gateway enters a monitoring mode.
In a specific embodiment, the command packet further includes a heartbeat packet; the method further comprises the steps of:
judging whether the LoRa gateway receives the heartbeat packet of the child node or not;
if the result is yes, updating an online list based on the heartbeat packet; and the online list stores state information of whether the child node connected with the LoRa gateway is online or not.
In a specific embodiment, after receiving the heartbeat packet, the LoRa gateway further includes:
resetting the countdown of the child node;
and when the countdown time arrives and the LoRa gateway does not receive the next heartbeat packet of the child node, confirming that the child node is offline, and sending the information of the child node data loss to a preset superior server.
In a specific embodiment, the method further comprises:
after the transmission of the data packet is completed, the child node and the LoRa gateway respectively return to a preset channel; and recovering the address of the LoRa gateway to a preset address so that the LoRa gateway reenters a monitoring mode.
In one specific embodiment of the present invention,
the processing end is an MCU, and the power supply comprises a rechargeable battery.
In a specific embodiment, the system further comprises an external sensor, a processing end, and a power supply; the power supply is respectively connected with the external sensor, the processing end and the child node; the external sensor is connected with the processing end, and the processing end is connected with the sub-node, so that the data collected by the external sensor can be reported to the LoRa gateway through the sub-node.
In a specific embodiment, the child node uses a 433Mhz frequency band.
In a specific embodiment, the sub-node is in a low power consumption mode when the data to be transmitted is not acquired, and the sub-node is switched from the low power consumption mode to a data transmission working mode when the data to be transmitted is acquired, and is restored to the low power consumption mode after the data transmission is completed.
The embodiment of the invention also provides a device which is applied to a system comprising the LoRa gateway and the child nodes, wherein the data sent by each child node to the LoRa gateway comprises a command packet and a data packet; the command packet comprises a frequency hopping packet; the apparatus comprises functional modules for performing the methods described above.
Therefore, the embodiment of the invention provides a network anti-blocking method and device based on LoRa, which are applied to a system comprising a LoRa gateway and sub-nodes, wherein data sent by each sub-node to the LoRa gateway comprises a command packet and a data packet; the command packet comprises a frequency hopping packet; the method comprises the following steps: judging whether the LoRa gateway receives a frequency hopping packet from a child node or not; the frequency hopping packet comprises a channel and a transmission rate requested by the child node; if the judgment result is yes, returning a confirmation instruction to the child node through the LoRa gateway, and setting the LoRa gateway based on the frequency hopping packet; and transmitting the data packet between the LoRa gateway and the child node based on the set channel and the transmission rate. The scheme uses the frequency hopping technology to realize the wireless transmission system with the anti-blocking function. The method is used for solving the defect of data packet blocking of the wireless transmission system in severe environments such as outdoors.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a network anti-blocking method based on LoRa according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a network anti-blocking method based on LoRa according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a network anti-blocking method based on LoRa according to an embodiment of the present invention;
Detailed Description
Hereinafter, various embodiments of the present disclosure will be more fully described. The present disclosure is capable of various embodiments and of modifications and variations therein. However, it should be understood that: there is no intention to limit the various embodiments of the disclosure to the specific embodiments disclosed herein, but rather the disclosure is to be interpreted to cover all modifications, equivalents, and/or alternatives falling within the spirit and scope of the various embodiments of the disclosure.
The terminology used in the various embodiments of the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the various embodiments of the disclosure. As used herein, the singular is intended to include the plural as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of this disclosure belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having a meaning that is the same as the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in the various embodiments of the disclosure.
Example 1
The embodiment 1 of the invention discloses a network anti-blocking method based on LoRa, which is shown in fig. 1 or 2 and is applied to a system (shown in fig. 3) comprising a LoRa gateway and sub-nodes, wherein data sent by each sub-node to the LoRa gateway comprises a command packet and a data packet; the command packet comprises a frequency hopping packet; the method comprises the following steps:
step 101, judging whether the LoRa gateway receives a frequency hopping packet from a child node; the frequency hopping packet comprises a channel and a transmission rate requested by the child node;
102, if the judgment result is yes, returning a confirmation instruction to the child node through the LoRa gateway, and setting the LoRa gateway based on the frequency hopping packet;
the child node negotiates a channel and a transmission rate for transmitting the data packet with the LoRa gateway through the command packet. After negotiation, a frequency hopping mode is started in the LoRa gateway, a regHopperiod register and a FreqHoppingperiod register are operated to be set to be non-zero values, then a frequency hopping channel which is in negotiation is set in a frequency hopping management register of the LoRa gateway according to a frequency lookup table, data is sent out, after the set frequency hopping period is completed, a new frequency is jumped, at the moment, fhssChangeChannel interruption is generated, the interruption of the channel is changed, at the moment, the LoRa gateway and a child node are switched to the next channel of a frequency hopping predefined list, and data packets are ready to start to be transmitted.
And step 103, carrying out data packet transmission between the LoRa gateway and the child node based on the set channel and the transmission rate.
Specifically, the invention realizes frequency hopping operation through a custom communication protocol, avoids a channel with busy communication, ensures normal receiving and transmitting of data packets, and ensures the stability and reliability of networking. The child node frequently collects data and reports the data to the LoRa gateway, and channel busy and channel blockage are inevitably generated, so that the situation is avoided; the protocol in the scheme divides the data packet into a command packet (i.e. a command packet) and a data packet (i.e. a data packet), and the command packet is divided into two types:
one is a heartbeat packet, which is used by a child node to report its own online status to a gateway;
one is a frequency hopping packet, which contains the address of the child node, the channel and the radio rate of the frequency hopping, and is used for the transmission channel and the radio rate of the child node and the LoRa gateway protocol data packet.
After the transmission is completed, the LoRa gateway and the child node return to the preset frequency band again, the preset frequency band is used for transmitting command packets, and the frequency band with the protocol frequency hopping is used for transmitting data packets.
Further, the protocol format of the Command packet is: start code (sixteen bits) +command identification code (sixteen bits) +destination address H bits (sixteen bits) +destination address L bits (sixteen bits) +channel (sixteen bits) +data (several bits) +check bits (sixteen bits);
protocol format of data packet: start code (sixteen bits) +command identification code (sixteen bits) +destination address H (sixteen bits) +destination address L (sixteen bits) +channel (sixteen bits) +data (several bits) +check bit (sixteen bits) +end code (sixteen bits).
Specifically, as shown in fig. 2, before determining whether the LoRa gateway receives the frequency hopping packet from the child node, the method further includes:
initializing the LoRa gateway and each child node by powering on;
setting the same channel and the same transmission rate for the LoRa gateway and each child node; specifically, when the system is powered on and initialized, the gateway node sets a default monitoring address 0xfff, the gateway node and the child node set the same channel and transmission rate, set the transmitting power, set the working mode, and set the serial port baud rate and the check bit.
Setting the address of the LoRa gateway as a preset address so that the LoRa gateway enters a monitoring mode.
Specifically, the command packet further includes a heartbeat packet; as shown in fig. 2, the method further includes:
judging whether the LoRa gateway receives the heartbeat packet of the child node or not;
if the result is yes, updating an online list based on the heartbeat packet; and the online list stores state information of whether the child node connected with the LoRa gateway is online or not.
In a mesh networking system, when the system is started and initialized, all nodes work on the same common channel, a sub-node sends a heartbeat packet to a gateway, updates an online list of the LoRa gateway, and reports the system state of the sub-node to the LoRa gateway.
Further, after receiving the heartbeat packet, the LoRa gateway further includes:
resetting the countdown of the child node;
and when the countdown time arrives and the LoRa gateway does not receive the next heartbeat packet of the child node, confirming that the child node is offline, and sending the information of the child node data loss to a preset superior server.
Specifically, the child node must send its own heartbeat packet to the gateway within a specified time range, report its own node information to the gateway, update the online list of the child node of the system after the gateway receives the heartbeat packet of the child node, reset the count-down Timer of the child node, and start counting down, if the count Timer register is emptied but the next heartbeat packet of the corresponding node is not received, the node is in an offline state, and should report the data loss of the node to the upper server.
In a specific embodiment, the method further comprises:
after the transmission of the data packet is completed, the child node and the LoRa gateway respectively return to a preset channel; and recovering the address of the LoRa gateway to a preset address so that the LoRa gateway reenters a monitoring mode.
Specifically, after the data is transmitted in the channels in agreement, the LoRa gateway and the child node return to the predefined channels respectively, and the LoRa gateway sets the address of the LoRa gateway to 0xfff, that is, the LoRa gateway is in the broadcast monitoring mode, and starts a new round of monitoring.
In a specific embodiment, the processing end is an MCU (i.e., a single-chip microcomputer), and the power supply includes a rechargeable battery.
In a specific embodiment, the system further comprises an external sensor, a processing end, and a power supply; the power supply is respectively connected with the external sensor, the processing end and the child node; the external sensor is connected with the processing end, and the processing end is connected with the sub-node, so that the data collected by the external sensor can be reported to the LoRa gateway through the sub-node.
Specifically, the system comprises an MCU, a related external sensor, an external equipment interface, a LoRa wireless transmission module and a power supply module; the power module supplies power to the equipment, the MCU collects data and transmits the data to the LoRa gateway through the connected LoRa wireless transmission module, and the LoRa gateway reports the data to the remote server. The sub-node and the LoRa gateway are used for realizing long-distance low-power transmission, 433Mhz is used for avoiding the application frequency band, 1Mhz frequency is used as a stepping channel, 32 channels can be switched by using the frequency hopping technology, and the transmission distance of 3000 meters can be realized. And the power supply part uses a loose 18650 chargeable battery core to supply power for the system, the capacity is 3400mAh, the long-time operation of the system is realized, and a TP4056 charging chip is used for providing the maximum charging current of 1A for the battery, so that the rapid charging of the system is realized. And the MCU part is used for acquiring data required by the system by using an external sensor, transmitting the data to the LoRa module in a set time range through the spi interface, and reporting the acquired data to the LoRa gateway by the LoRa module. The LoRa uses 433m wireless transmission frequency, the anti-interference performance is strong, and the signal-to-noise ratio of the output end of the frequency modulation receiver of the wireless transmission module is larger than that of the output end of the amplitude modulation receiver under the condition that the input signal-to-noise ratio (S/N for short) is the same. The wireless transmitting module has extremely high frequency stability, extremely high cost performance and perfect antistatic maintenance, and is suitable for long-distance low-power-consumption low-rate data transmission.
Therefore, the working conditions of the scheme in operation are as follows: a power supply 3.3v; the temperature is 25 ℃, the crystal oscillator frequency is 32MHz, the Bandwidth (BW) is 125kHz, the Spreading Factor (SF) =12, the error correction rate (EC) =4/6, the Packet Error Rate (PER) is 1%, the CRC check is started, the output power is 13dBm, and the data packet length is 64 bits. The preamble is 12 characters long with impedance matching. FSK, OOK modulation mode and LoRa mode can be switched, and modulation mode can be switched through SPI interface configuration register regOpMode.
In a specific embodiment, the sub-node is in a low power consumption mode when the data to be transmitted is not acquired, and the sub-node is switched from the low power consumption mode to a data transmission working mode when the data to be transmitted is acquired, and is restored to the low power consumption mode after the data transmission is completed. Specifically, the child node is in a low power consumption mode when idle, and when data transmission is needed, the child node wakes up partially, and continues to sleep after the data transmission is completed.
Example 2
The embodiment 2 of the invention also discloses a device which is applied to a system comprising the LoRa gateway and the sub-nodes, wherein the data sent by each sub-node to the LoRa gateway comprises a command packet and a data packet; the command packet comprises a frequency hopping packet; the apparatus includes functional modules for performing the method described in embodiment 1. Other relevant content is also disclosed in embodiment 2, and the specific relevant content is described in embodiment 1.
Therefore, the embodiment of the invention provides a network anti-blocking method and device based on LoRa, which are applied to a system comprising a LoRa gateway and sub-nodes, wherein data sent by each sub-node to the LoRa gateway comprises a command packet and a data packet; the command packet comprises a frequency hopping packet; the method comprises the following steps: judging whether the LoRa gateway receives a frequency hopping packet from a child node or not; the frequency hopping packet comprises a channel and a transmission rate requested by the child node; if the judgment result is yes, returning a confirmation instruction to the child node through the LoRa gateway, and setting the LoRa gateway based on the frequency hopping packet; and transmitting the data packet between the LoRa gateway and the child node based on the set channel and the transmission rate. The scheme uses the frequency hopping technology to realize the wireless transmission system with the anti-blocking function. The method is used for solving the defect of data packet blocking of the wireless transmission system in severe environments such as outdoors.
Those skilled in the art will appreciate that the drawing is merely a schematic illustration of a preferred implementation scenario and that the modules or flows in the drawing are not necessarily required to practice the invention.
Those skilled in the art will appreciate that modules in an apparatus in an implementation scenario may be distributed in an apparatus in an implementation scenario according to an implementation scenario description, or that corresponding changes may be located in one or more apparatuses different from the implementation scenario. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
The above-mentioned inventive sequence numbers are merely for description and do not represent advantages or disadvantages of the implementation scenario.
The foregoing disclosure is merely illustrative of some embodiments of the invention, and the invention is not limited thereto, as modifications may be made by those skilled in the art without departing from the scope of the invention.
Claims (7)
1. The network anti-blocking method based on the LoRa is characterized by being applied to a system comprising a LoRa gateway and sub-nodes, wherein data sent by each sub-node to the LoRa gateway comprises command packets and data packets; the command packet comprises a frequency hopping packet; the method comprises the following steps:
judging whether the LoRa gateway receives a frequency hopping packet from a child node or not; the frequency hopping packet comprises a channel and a transmission rate requested by the child node;
if the judgment result is yes, returning a confirmation instruction to the child node through the LoRa gateway, and setting the LoRa gateway based on the frequency hopping packet;
transmitting data packets between the LoRa gateway and the child node based on the set channel and the transmission rate;
before determining whether the LoRa gateway receives the frequency hopping packet from the child node, the method further includes:
initializing the LoRa gateway and each child node by powering on;
setting the same channel and the same transmission rate for the LoRa gateway and each child node;
setting the address of the LoRa gateway as a preset address so that the LoRa gateway enters a monitoring mode;
the command packet further comprises a heartbeat packet; the method further comprises the steps of:
judging whether the LoRa gateway receives the heartbeat packet of the child node or not;
if the result is yes, updating an online list based on the heartbeat packet; the online list stores state information of whether the child node connected with the LoRa gateway is online or not;
after the transmission of the data packet is completed, the child node and the LoRa gateway respectively return to a preset channel; and recovering the address of the LoRa gateway to the preset address so that the LoRa gateway reenters a monitoring mode.
2. The method of claim 1, wherein the LoRa gateway, after receiving the heartbeat packet, further comprises:
resetting the countdown of the child node;
and when the countdown time arrives and the LoRa gateway does not receive the next heartbeat packet of the child node, confirming that the child node is offline, and sending the information of the child node data loss to a preset superior server.
3. The method of claim 1, wherein the system further comprises an external sensor, a processing end, a power source; the power supply is respectively connected with the external sensor, the processing end and the child node; the external sensor is connected with the processing end, and the processing end is connected with the sub-node, so that the data collected by the external sensor can be reported to the LoRa gateway through the sub-node.
4. The method of claim 3, wherein the child node employs a frequency band of 433 Mhz.
5. A method as claimed in claim 3, wherein the processing terminal is an MCU and the power source comprises a rechargeable battery.
6. The method of claim 1, wherein the child node is in a low power mode when data to be transmitted is not acquired, and the child node switches from the low power mode to an operating mode for transmitting data when data to be transmitted is acquired, and resumes the low power mode after data transmission is completed.
7. An apparatus, characterized in that, in a system comprising a LoRa gateway and sub-nodes, data sent by each sub-node to the LoRa gateway comprises a command packet and a data packet; the command packet comprises a frequency hopping packet; the apparatus comprising functional modules for performing the method of any of claims 1-6.
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| CN112367148B (en) * | 2020-10-22 | 2022-05-17 | 华南农业大学 | Large-area hillside orchard LoRa wireless transmission frame loss detection method and device |
| CN112689252B (en) * | 2020-12-04 | 2023-10-27 | 广东亚太天能科技股份有限公司 | Physical layer-based intelligent home Internet of things transmission system and method |
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| EP2738948A1 (en) * | 2012-11-28 | 2014-06-04 | Sercel | Method for setting frequency channels in a multi-hop wireless mesh network. |
| US11147459B2 (en) * | 2018-01-05 | 2021-10-19 | CareBand Inc. | Wearable electronic device and system for tracking location and identifying changes in salient indicators of patient health |
| EP3591853B1 (en) * | 2018-07-02 | 2021-09-01 | Semtech Corporation | Low-power, frequency-hopping, wide-area network with random medium access |
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| CN103906044A (en) * | 2014-03-04 | 2014-07-02 | 杭州迅龙科技有限公司 | Networking method of wireless electricity consumption information acquisition ad hoc network |
| CN108471642A (en) * | 2018-03-26 | 2018-08-31 | 厦门四信通信科技有限公司 | A kind of infusion pump network of LoRa transmission |
| CN110572481A (en) * | 2019-10-15 | 2019-12-13 | 广西交通科学研究院有限公司 | intelligent electromechanical equipment data interaction method and system based on LoRa communication |
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